package com.ddlottery.tools;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
 * Created by ElNino on 16/2/3.
 */
public class md5_16 {

        private final static char[] hexDigits = { '0', '1', '2', '3', '4', '5',
                '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
        private static String bytesToHex(byte[] bytes) {
            StringBuffer sb = new StringBuffer();
            int t;
            for (int i = 0; i < 16; i++) {
                t = bytes[i];
                if (t < 0)
                    t += 256;
                sb.append(hexDigits[(t >>> 4)]);
                sb.append(hexDigits[(t % 16)]);
            }
            return sb.toString();
        }
        public static String md5(String input) throws Exception {
            return code(input, 32);
        }
        public static String code(String input, int bit) throws Exception {
            try {
                MessageDigest md = MessageDigest.getInstance(System.getProperty(
                        "MD5.algorithm", "MD5"));
                if (bit == 16)
                    return bytesToHex(md.digest(input.getBytes("utf-8")))
                            .substring(8, 24);
                return bytesToHex(md.digest(input.getBytes("utf-8")));
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
                throw new Exception("Could not found MD5 algorithm.", e);
            }
        }
        public static String md5_3(String b) throws Exception{
            MessageDigest md = MessageDigest.getInstance(System.getProperty(
                    "MD5.algorithm", "MD5"));
            byte[] a = md.digest(b.getBytes());
            a = md.digest(a);
            a = md.digest(a);

            return bytesToHex(a);
        }
}
